本示例在已安装flutter、CocoaPods环境下:

安装Flutter：https://flutterchina.club/setup-macos/
安装CocoaPods: https://cocoapods.org

创建一个文件夹SwiftFlutterDemo(示例)，文件目录结构：

filePath.png
切换flutter分支到master，先查看当前分支：

flutter channe  //查看当前分支

如果当前分支是master则忽略以下操作：

flutter channel master //切换分支

在SwiftFlutterDemo目录下：

flutter create -t module myflutter

创建一个flutter项目（flutter项目命名规则：[a-z0-9_]）

在SwiftFlutterDemo目录下新建一个iOS项目iosFlutter，BitCode设置成NO，因为Flutter混合开发不支持Bitcode

Bitcode.png
安装Cocoapods，在iosFlutter目录下执行：

pod init

创建Podfile文件

platform :ios, '9.0'
target 'iosFlutter' do
 # Comment the next line if you don't want to use dynamic frameworks
 use_frameworks!
 # Pods for iosFlutter

flutter_application_path = '../myflutter'
load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
install_all_flutter_pods(flutter_application_path)

end

之后执行

pod install

command+B，build一下，如果没有报错，那么部署成功
代码实现
在AppDelegate.swift中实现以下代码：

import FlutterPluginRegistrant //引入插件

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    
    lazy var liftCycleDelegate: FlutterPluginAppLifeCycleDelegate = {
        let delegate = FlutterPluginAppLifeCycleDelegate.init()
        return delegate
    }()

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        GeneratedPluginRegistrant.register(with: self as? FlutterPluginRegistry)
        return liftCycleDelegate.application(application, didFinishLaunchingWithOptions: launchOptions ?? [:])
    }
}

在ViewController中创建一个按钮，本例是用StoryBoard创建

import Flutter //引入头文件

 @IBAction func onClick(_ sender: Any) {
        let flutterVC: FlutterViewController = FlutterViewController.init()
        //默认打开方式
        flutterVC.setInitialRoute("routel")
        self.navigationController?.pushViewController(flutterVC, animated: true)
}

Hot Reload:用Simulator 需要提前打开，然后在myflutter目录下执行：

flutter attach

之后终端会输出以下信息：

HehuimindeMacBook-Pro:myflutter Hehuimin$ flutter attach
Checking for advertised Dart observatories...
Waiting for a connection from Flutter on iPhone Xs Max...

如果一直卡在这里，只需在xCode中运行即可（设备要一致），然后修改flutter代码，ctr+s保存，在终端输入r即可